From 655092d568720188a3a34b9376a7ebcf274dab79 Mon Sep 17 00:00:00 2001
From: Reimu NotMoe <reimu@sudomaker.com>
Date: Fri, 27 Dec 2024 04:17:26 +0800
Subject: [PATCH] dcd_pic: check USBBUSY bit on PIC32s

---
 src/portable/microchip/pic/dcd_pic.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/portable/microchip/pic/dcd_pic.c b/src/portable/microchip/pic/dcd_pic.c
index a4fa0e840..b4a698199 100644
--- a/src/portable/microchip/pic/dcd_pic.c
+++ b/src/portable/microchip/pic/dcd_pic.c
@@ -492,6 +492,9 @@ bool dcd_init(uint8_t rhport, const tusb_rhport_init_t* rh_init) {
   tu_memclr(&_dcd, sizeof(_dcd));
 
 #if TU_PIC_INT_SIZE == 4
+  // The USBBUSY bit is present on PIC32s and we're required to check it
+  // prior to powering on the USB peripheral (see DS61126F page 27)
+  while (U1PWRCbits.USBBUSY);
   U1PWRCSET = _U1PWRC_USBPWR_MASK;
 #else
   U1PWRCbits.USBPWR = 1;